In the United States, UPS observes the following holidays:

New Year’s Day - January 1, 2019
Easter Sunday - April 21, 2019
Memorial Day - May 27, 2019
Independence Day - July 4, 2019
Labor Day - September 2, 2019
Thanksgiving Day - November 28, 2019
Christmas Day - December 25, 2019
New Year’s Day - January 1, 2020

More Info > US Holiday Operations Schedule